WO2021237845A1 - 可折叠显示装置 - Google Patents

可折叠显示装置 Download PDF

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Publication number
WO2021237845A1
WO2021237845A1 PCT/CN2020/097697 CN2020097697W WO2021237845A1 WO 2021237845 A1 WO2021237845 A1 WO 2021237845A1 CN 2020097697 W CN2020097697 W CN 2020097697W WO 2021237845 A1 WO2021237845 A1 WO 2021237845A1
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WO
WIPO (PCT)
Prior art keywords
frame
foldable
display device
housing
flexible display
Prior art date
Application number
PCT/CN2020/097697
Other languages
English (en)
French (fr)
Inventor
韩文
Original Assignee
武汉华星光电半导体显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US16/966,642 priority Critical patent/US11783734B2/en
Publication of WO2021237845A1 publication Critical patent/WO2021237845A1/zh

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1675—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts
    • G06F1/1681—Details related solely to hinges
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
    • G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1656—Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories

Definitions

  • This application relates to the field of display technology, and in particular to a foldable display device.
  • Flexible screen mobile phones refer to mobile phones with bendable and flexible screens. Compared with traditional screens, flexible screens have obvious advantages. They are not only lighter and thinner in size, but also lower in power consumption than original devices, which helps to improve the equipment. Endurance, based on its bendable and flexible characteristics, its durability is also much higher than that of traditional screens, reducing the probability of accidental damage to the device.
  • FIG. 1 it is an exploded schematic diagram of a conventional flexible display device.
  • the flexible display device includes a front frame 200, a flexible display panel 201, a metal sheet 202, a support plate 203, a middle frame assembly 204, and the like.
  • the entire surface of the metal sheet is arranged on the lower surface of the flexible display panel to reduce waviness and creases.
  • the support plate is only distributed in the non-bending area.
  • the high strength of the support plate supports the flexible display panel and improves the convenience of assembly of the flexible display panel with the whole machine. Because it is separated in the bending area, the support plate is relatively thick ( About 0.3 mm), resulting in a step difference in the middle bending area, and it is difficult to ensure the flatness of the whole machine.
  • the front frame or decorative strip presses the edge of the flexible display panel, causing the upper surface of the front frame and the upper surface of the flexible display panel to be different from the same plane.
  • the level difference causes the flexible display device to have a bad touch and appearance. Not beautiful.
  • the purpose of the present application is to provide a foldable display device, which has good flatness and good appearance.
  • a foldable display device including:
  • One side of the flexible display module is arranged on the first housing and the second housing, and the flexible
  • the other side of the display module is provided with the hard foldable functional layer, and the hard foldable functional layer is located on the light emitting side of the flexible display module.
  • the rigid foldable functional layer is ultra-thin glass, and the thickness of the ultra-thin glass is 10 micrometers to 300 micrometers.
  • the foldable display device includes a first non-bending area, a second non-bending area, and connected between the first non-bending area and the second non-bending area
  • the first housing and the second housing both have accommodating cavities, and the portion of the flexible display module corresponding to the first non-bending area is disposed on the first housing In the accommodating cavity, a portion of the flexible display module corresponding to the second non-bending area is disposed in the accommodating cavity of the second housing, and a portion of the flexible display module corresponding to the bending area Connected between a portion of the flexible display module corresponding to the first non-bending area and a portion of the flexible display module corresponding to the second non-bending area.
  • the foldable display device further includes a frame-shaped connector
  • the frame-shaped connector includes a frame-shaped portion and the opening located in the frame-shaped portion, one of the frame-shaped portion
  • the surface is connected with the first housing and the second housing, the other surface of the frame-shaped portion is connected with the hard foldable functional layer, and the opening of the frame-shaped connector corresponds to the flexible display
  • the module is arranged, and one surface of the frame-shaped portion is opposite to the other surface of the frame-shaped portion.
  • the foldable display device includes a first non-bending area, a second non-bending area, and connected between the first non-bending area and the second non-bending area
  • the frame-shaped connector has a first area and a second area, the first area of the frame-shaped connector corresponds to the bending area, and the second area of the frame-shaped connector corresponds to The first non-bending area and the second non-bending area, the part of the frame-shaped connecting member corresponding to the second area is fixed on the first housing and the second housing ,
  • the elastic modulus of the frame-shaped connector in the first area is smaller than the elastic modulus of the frame-shaped connector in the second area.
  • the elastic modulus of the frame-shaped connector in the first area is 1 MPa-100 MPa, and the elastic modulus of the frame-shaped connector in the second area is greater than 150 GPa.
  • the frame-shaped connecting member of the first area is provided with a plurality of grooves that are spaced and staggered.
  • a plurality of the grooves arranged alternately and spaced apart are arranged symmetrically with respect to the bending center axis of the foldable display device, and each groove is arranged along the frame-shaped connecting member.
  • the dimension in the width direction of the frame-shaped portion is larger than the dimension of the same groove along the length direction of the frame-shaped connecting piece.
  • the depth of the groove is less than or equal to the thickness of the frame-shaped connecting member.
  • the depth of the groove is smaller than the thickness of the frame-shaped connector, and the groove is filled with elastic rubber.
  • the width of the frame-shaped portion of the frame-shaped connector is equal to 1/2 of the difference between the width of the rigid foldable functional layer and the width of the flexible display module.
  • the width of the rigid foldable functional layer is greater than the width of the flexible display module.
  • the peripheral edge of the frame-shaped connector is flush with the peripheral edge of the hard foldable functional layer, and the peripheral edge of the frame-shaped connector is aligned with the first housing and the The peripheral edges of the second casing are flush.
  • the material of the frame-shaped connecting member is selected from at least one of stainless steel, amorphous material, nickel-copper alloy, and aluminum alloy.
  • the size of the opening is greater than or equal to the size of the flexible display module.
  • the width of the frame-shaped portion of the frame-shaped connector is greater than or equal to the width of the side plate of the second housing of the first housing.
  • the foldable display device further includes a protective film disposed on a side of the rigid foldable functional layer away from the flexible display module, and the protective film has a thickness of 5 microns- 30 microns.
  • the protective film is made of at least one material selected from polyimide or polyethylene terephthalate.
  • the thickness of the protective film is 10 ⁇ m-25 ⁇ m.
  • the part of the rigid foldable functional layer corresponding to the flexible display module is connected to the flexible display module through an optical adhesive layer, and the width of the rigid foldable functional layer is greater than that of the flexible display module.
  • the width of the flexible display module, the length of the rigid foldable functional layer is greater than the length of the flexible display module.
  • the Young's modulus of the rigid foldable functional layer is 50 GPa-100 GPa, and the hardness of the rigid foldable functional layer is 5 GPa-15 GPa.
  • the foldable display device of the present application removes the front frame and the support plate, and arranges the rigid foldable functional layer on the light-exit side of the foldable display module and is fixed on the housing to provide a good effect on the foldable display device.
  • the hard foldable functional layer will not appear folded creases after being bent, it can avoid the unevenness or creases of the foldable display device, and The surface hardness and strength of the rigid foldable functional layer is high, and the friction resistance is good, avoiding the traditional colorless polyimide (CPI, Colorless Polyimide) material cover (Cover Window, CW) The problem of low surface hardness and scratch resistance.
  • This foldable display device can basically approach the specification requirements of current hard-screen display devices, and is more in line with the application requirements of end users.
  • a frame-shaped connector is used to connect the rigid foldable functional layer to the shell, and the rigidity of the frame-shaped connector is used to match the rigidity of the shell and the rigidity of the rigid foldable functional layer to avoid rigidity.
  • the rigid foldable functional layer is directly fixed on the housing, and the hard foldable functional layer is fixed on the frame-shaped connector, which facilitates the assembly, replacement and maintenance of the flexible display module.
  • a protective film is provided on the surface of the hard foldable functional layer away from the flexible display module. While the protective film has an explosion-proof effect on the hard foldable functional layer, the protective film can be a preparation screen for easy replacement, and Compared with the traditional colorless polyimide, the protective film has a smaller thickness to avoid obvious creases.
  • Figure 1 is an exploded schematic diagram of a traditional flexible display device
  • FIG. 2 is a three-dimensional schematic diagram of the foldable display device of this application when it is in an unfolded state
  • FIG. 3 is a perspective schematic diagram of the foldable display device shown in FIG. 2 when it is in a folded state;
  • FIG. 4 is a schematic cross-sectional view taken along the line A-A of the foldable display device shown in FIG. 2;
  • Figure 5 is an exploded schematic view of the foldable display device shown in Figure 2, wherein Figure 5 omits the polarizer and the back cover in Figure 4;
  • Fig. 6A is a first partial enlarged schematic diagram of the frame-shaped connector in Fig. 5;
  • FIG. 6B is a schematic diagram of the first groove shown in FIG. 6A;
  • 6C is another schematic plan view of the first groove according to the embodiment of the application.
  • Fig. 6D is a second partial enlarged schematic diagram of the frame-shaped connector in Fig. 5;
  • FIG. 7 is a schematic cross-sectional view of the foldable display device in a folded state shown in FIG. 3, in which the flexible display module is bent in a water drop shape;
  • Fig. 8 is a partial enlarged schematic diagram of the foldable display device shown in Fig. 7 in a folded state.
  • 100 foldable display device 100a first non-bending area; 100b second non-bending area; 100c bending area; 1011 first housing; 1012 second housing; 103 rigid foldable functional layer; 104 protective film 105 frame-shaped connector; 1051 frame-shaped part; 105a opening; 105b first area; 105c second area; 105d groove; 105d1 first groove; 105d2 second groove; 1011a containing cavity; 1021, 201 flexible Display panel; 1022 polarizer; 1023 rear cover; 1024 buffer layer; 200 front frame; 202 metal sheet; 203 support plate; 204 middle frame assembly; 1061 first support plate; 1062 second support plate.
  • Figure 2 is a perspective schematic diagram of the foldable display device of this application when it is in an unfolded state
  • Figure 3 is a perspective schematic diagram of the foldable display device shown in Figure 2 when it is in a folded state
  • Figure 4 is a perspective view of the foldable display device shown in Figure 2 The cross-sectional schematic diagram of the AA cut line of the foldable display device is shown
  • FIG. 5 is an exploded schematic diagram of the foldable display device shown in FIG. 2.
  • the foldable display device 100 includes a first housing 1011, a second housing 1012, a flexible display module, a rigid foldable functional layer 103, a protective film 104 and a frame-shaped connector 105.
  • the foldable display device 100 has a first non-bending area 100a, a second non-bending area 100b, and a bending area 100c connected between the first non-bending area 100a and the second non-bending area 100b.
  • the first housing 1011 and the second housing 1012 are arranged oppositely, and the first housing 1011 and the second housing 1012 are rotatably connected by a hinge assembly.
  • the first housing 1011 and the second housing 1012 are relatively rotated by a hinge assembly to realize the folding of the foldable display device.
  • the first housing 1011 and the second housing 1012 are both middle frames.
  • the first housing 1011 is used to support a portion of the flexible display module corresponding to the first non-bending area 100a
  • the second housing 1012 is used to support a portion of the flexible display module corresponding to the second non-bending area 100b.
  • the first housing includes a bottom plate and three side plates connected in sequence. The bottom plate and the three side plates connected in sequence enclose a cavity 1011a.
  • the portion of the flexible display module corresponding to the first non-bending area 100a is disposed in the first housing In the receiving cavity 1011a of the body 1011.
  • the second housing 1012 includes a bottom plate and three sequentially connected side plates. The bottom plate and the three sequentially connected side plates enclose a containing cavity.
  • the portion of the flexible display module corresponding to the second non-bending area 100b is disposed in the second housing In the accommodating cavity of the body 1012, the portion of the flexible display module corresponding to the bending area 100c is connected to the portion of the flexible display module corresponding to the first non-bending area 100a and the portion of the flexible display module corresponding to the second non-bending area 100b between.
  • the flexible display module is better protected.
  • the flexible display module includes a flexible display panel 1021, a polarizer 1022, a rear cover 1023, and a buffer layer 1024.
  • the buffer layer 1024, the back cover 1023, the flexible display panel 1021, and the polarizer 1022 are sequentially stacked.
  • the flexible display panel 1021 is used to display images.
  • the flexible display panel 1021 is a flexible organic light emitting diode display panel.
  • the buffer layer 1024 functions as a buffer.
  • the portions of the buffer layer 1024 corresponding to the first non-bending area 100a and the second non-bending area 100b are respectively disposed on the bottom plates of the first housing 1011 and the second housing 1012.
  • the buffer layer 1024 is a foam layer.
  • the back cover 1023 is used to protect the back surface of the light-emitting surface of the flexible display panel 1021.
  • the back cover 1023 and the buffer layer 1024 are connected by an adhesive layer.
  • the flexible display panel 1021 and the rear cover 1023 are connected by an adhesive layer.
  • the polarizer 1022 is used to increase the transmittance of ambient light, so as to increase the contrast of the flexible display panel 1021 during display.
  • the polarizer 1022 and the flexible display panel 1021 are connected by an adhesive layer.
  • a rigid foldable functional layer 103 is provided on the other side of the flexible display module.
  • the rigid foldable functional layer 103 is used to provide rigid support for the flexible display module, and is used as an exterior part of the foldable display device 100.
  • the rigid foldable functional layer 103 is transparent.
  • the part of the rigid foldable functional layer 103 corresponding to the first non-bending area 100a is connected to the first housing 1011, and the part of the rigid foldable functional layer 103 corresponding to the second non-bending area 100b is connected to the second housing 1012 And the rigid foldable functional layer 103 is located on the light emitting side of the flexible display module.
  • the width of the rigid foldable functional layer 103 is greater than the width of the flexible display module, and the length of the rigid foldable functional layer 103 is greater than the length of the flexible display module, so that the rigid foldable functional layer 103 can cover the entire flexible display module. While playing the role of rigid support, the part of the rigid foldable functional layer 103 that extends beyond the flexible display module can be fixed on the first housing 1011 and the second housing 1012.
  • the rigid foldable functional layer 103 not only has good rigidity but also bendable.
  • the rigid foldable functional layer 103 is ultra-thin glass.
  • the material of ultra-thin glass is inorganic transparent glass.
  • the thickness of ultra-thin glass ranges from 10 microns to 300 microns.
  • the thickness of the ultra-thin glass can also be 20 micrometers to 300 micrometers, for example, the thickness of the ultra-thin glass is 30 micrometers, 40 micrometers, 50 micrometers, 60 micrometers, 70 micrometers, 100 micrometers, and so on.
  • the Young's modulus of the rigid foldable functional layer 103 is 50 GPa-100 GPa, such as 60 GPa, 70 GPa, 80 GPa, etc., so that the rigid foldable functional layer 103 has high strength and better mechanical properties.
  • the hardness of the rigid foldable functional layer 103 is 5GPa-15GPa, for example, the hardness is 6GPa, 8GPa, 10GPa, so that the rigid foldable functional layer 103 has high surface hardness, has good friction resistance, and improves the foldable display device Among them, the hardness is the hardness measured by the indentation method.
  • the linear thermal expansion coefficient of the ultra-thin glass of the present application at a temperature of 20°C to 300°C is (7.0-10.0) ppm/°C, for example, 8 ppm/°C.
  • the glass transition temperature of ultra-thin glass is 550°C-650°C, for example, 600°C.
  • the roughness of the ultra-thin glass is less than 0.5 nanometers, for example, 0.001 nanometers.
  • the optical elastic coefficient of ultra-thin glass is (15-40) nm/cm/MPa, for example, 25 nm/cm/MPa.
  • supporting plates are provided on the first housing and the second housing to provide rigid support for the flexible display module in the non-bending area, which may cause a step difference.
  • This application removes the supporting plate and integrates the flexible display module as a whole The size is narrowed to be accommodated in the accommodating cavities in the first housing 1011 and the second housing 1012, and the entire surface of the rigid foldable functional layer 103 is used to provide rigid support for the flexible display module to avoid level differences , And the front frame is removed, and the rigid foldable functional layer 103 is used as the appearance part to further avoid the step difference and ensure that the foldable display device has good flatness during the bending process.
  • the frame-shaped connector 105 is used to connect the rigid foldable functional layer 103 to the first housing 1011 and the second housing 1012 to avoid the rigid foldable functional layer
  • the thickness of 103 is relatively thin and the strength is insufficient, so that it cannot be directly glued and fixed on the first housing 1011 and the second housing 1012, so as to avoid the problem of cracking of the rigid foldable functional layer 103.
  • the frame-shaped connector 105 frames the rigid foldable functional layer 103 on the first housing 1011 and the second housing 1012, which is more conducive to the replacement and maintenance of the flexible display module.
  • the rigidity of the frame-shaped connector 105 can prevent the frame portion of the rigid foldable functional layer 103 connected to the frame connector from being broken by force.
  • One surface of the frame-shaped portion 1051 is connected with the first housing 1011 and the second housing 1012, and the other surface of the frame-shaped portion 1051 is connected with the hard foldable functional layer 103.
  • the surface of the frame-shaped connector 105 close to the hard foldable functional layer 103 is all coated with adhesive.
  • the frame-shaped connector 105 is connected with the first housing 1011 through an adhesive layer, and the frame-shaped connector 105 passes through the second housing 1012. Adhesive layer connection.
  • the part of the rigid foldable functional layer 103 corresponding to the flexible display module is connected to the flexible display module through an optical adhesive layer, so that the rigid foldable functional layer 103 and the flexible display module are synchronized during the bending process, and avoid There is a gap between the two and a step difference causes unevenness.
  • the part of the rigid foldable functional layer 103 corresponding to the flexible display module is connected to the polarizer 1022 through an optical adhesive layer.
  • the optical adhesive layer connecting the flexible display module and the rigid foldable functional layer 103 is close to the surface of the rigid foldable functional layer 103 and the frame-shaped connector 105 is close to the rigid foldable function
  • the surface of the layer 103 is on the same plane to ensure that the part of the rigid foldable functional layer 103 connected to the frame-shaped connector 105 and the part connected to the flexible display module are on the same plane, so as to improve the flatness of the rigid foldable functional layer 103 , Thereby improving the flatness of the foldable display device.
  • the frame-shaped connector 105 includes a frame-shaped portion 1051 and an opening 105a located in the frame-shaped portion 1051, and the frame-shaped connector 105 is rectangular.
  • the opening 105a is also rectangular.
  • the opening 105a of the frame-shaped connector 105 is arranged corresponding to the flexible display module, and the size of the opening 105a is greater than or equal to the size of the flexible display module, so as to prevent the frame-shaped connector 105 from emitting to the flexible display panel 1021 in the flexible display module. The light is blocked, and the frame-shaped connector 105 is used as the frame of the flexible display module.
  • the width of the frame portion 1051 of the frame connector 105 is equal to 1/2 of the difference between the width of the rigid foldable functional layer 103 and the width of the flexible display module, so that the flexible display module can be assembled in the first housing 1011 And on the second housing 1012.
  • the width of the frame-shaped portion 1051 of the frame-shaped connector 105 is greater than or equal to the width of the side plates of the first housing 1011 and the second housing 1012, so that the frame-shaped connector 105 is connected to the first housing 1011 and the second housing
  • the area of the connection between 1012 is maximized, so that the frame-shaped connecting piece 105 can be better connected with the first housing 1011 and the second housing 1012, and the frame-shaped connecting piece 105 and the first housing 1011 and the second housing 1011 can be lowered. Risk of separation of the housing 1012.
  • the width of the frame portion 1051 of the frame connector 105 is greater than the width of the side plates of the first housing 1011 and the second housing 1012.
  • the peripheral edge of the frame-shaped connector 105 is flush with the peripheral edge of the rigid foldable functional layer 103, and the peripheral edge of the frame-shaped connector 105 is flush with the peripheral edges of the first housing 1011 and the second housing 1012 to make The edges of the foldable display device 100 are more beautiful, and the end user has a better experience.
  • the protective film 104 is used to explode the hard foldable functional layer 103 and at the same time serves as a preliminary screen for easy replacement.
  • the protective film 104 is disposed on the side of the rigid foldable functional layer 103 away from the flexible display module, and the thickness of the protective film 104 is 5 ⁇ m-30 ⁇ m. Compared with the traditional transparent polyimide cover plate, the present application reduces the thickness of the protective film 104 to avoid obvious creases during the folding process of the protective film 104.
  • the thickness of the protective film 104 may also be 10 ⁇ m-25 ⁇ m, for example, 15 ⁇ m, 18 ⁇ m, and 20 ⁇ m.
  • the preparation material of the protective film is selected from at least one of polyimide or polyethylene terephthalate.
  • the frame-shaped connector 105 includes a first area 105b and a second area 105c.
  • the first area 105b of the frame-shaped connector 105 corresponds to the bending area 100c
  • the second area 105c of the frame-shaped connector 105 corresponds to the first non-bending area 100a.
  • the second non-bending area 100b is located between the two second areas 105c.
  • the part of the frame-shaped connecting member 105 corresponding to the second area 105c is fixed on the first housing 1011 and the second housing 1012.
  • the elastic modulus of the frame-shaped connector 105 in the first area 105b is smaller than the elastic modulus of the frame-shaped connector 105 in the second area 105c, so that the frame-shaped connector 105 corresponds to the first non-bending area 100a and the second non-bending area 100a.
  • the rigidity of the bending area 100b can match the rigidity of the first housing 1011, the second housing 1012 and the rigid foldable functional layer 103, and it is ensured that the part of the frame-shaped connector 105 corresponding to the bending area 100c is easy to bend It is folded and has high ductility, and is easy to extend and recover during the bending process of the foldable display device.
  • the frame-shaped connector 105 of the first area 105b is provided with a plurality of grooves 105d spaced apart and staggered so that the elastic modulus of the frame-shaped connector 105 of the first area 105b is smaller than that of the frame-shaped connector 105 of the second area 105c
  • the modulus of elasticity is 1 MPa-100 MPa, such as 5 MPa, 10 MPa, 30 MPa, 50 MPa, and 85 MPa; the elastic modulus of the frame-shaped connector 105 in the second region 105c is greater than 150 GPa, for example It is 190GPa, 200GPa, etc.
  • the preparation material of the frame-shaped connecting member 105 is selected from at least one of stainless steel, amorphous material, nickel-copper alloy and aluminum alloy. Specifically, the preparation material of the frame-shaped connector 105 is stainless steel, so that the frame-shaped connector 105 has good rigidity and foldability.
  • the frame-shaped connector 105 when the foldable display device 100 is in the flat state, the frame-shaped connector 105 is in the flat state, the length of the frame-shaped connector 105 in the first area 105b is W, and the flexible display module corresponds to the bending area
  • the part length of 100c is L1
  • the length W of the frame-shaped connecting member 105 of the first area 105b is greater than the length L1 of the part of the flexible display module corresponding to the bending area 100c.
  • the length of the portion of the flexible display module corresponding to the bending area 100c is L2.
  • the flexible display module is bent in a water drop shape as shown in FIGS.
  • FIG. 7 is a schematic cross-sectional view of the foldable display device in the folded state shown in FIG. 3, and FIG. 8 is a partial enlarged schematic view of the foldable display device in the folded state shown in FIG.
  • the foldable display device shown in FIG. 7 includes a first support plate 1061 and a second support plate 1062.
  • the first support plate 1061 and the second support plate 1062 are both disposed in the accommodating cavity of the first housing 1011, and the first support The board 1061 and the second support board 1062 are both arranged in the accommodating cavity of the second housing 1012.
  • the first support board 1061 in the first housing 1011 supports the flexible display module corresponding to the first A part of the non-bending area
  • the first support plate 1061 in the second housing 1012 supports the part of the flexible display module corresponding to the second non-bending area
  • the second support plate 1062 and the second support plate 1062 in the first housing 1011 The second support plate 1062 in the housing 1012 is partially attached to the portion of the flexible display module corresponding to the bending area, so that the portion of the flexible display module corresponding to the bending area smoothly transitions into a drop shape.
  • the frame-shaped connecting member 105 of the first region 105b is provided with a plurality of grooves 105d arranged at intervals, and the grooves 105d arranged at intervals are distributed in a staggered manner.
  • the groove 105d includes a first groove 105d1 and a second groove 105d2.
  • the second groove 105d2 is provided on two opposite edges of the frame-shaped connector 105 in the first area 105b, and the first groove 105d1 is provided between the two opposite edges of the frame-shaped connector 105 in the first area 105b.
  • the two opposite edges are opposite edges of the frame-shaped connecting member 105 in the width direction.
  • the depth of the groove is equal to the thickness of the frame-shaped connector.
  • the depth of the first groove 105d1 and the depth of the second groove 105d2 are both equal to the thickness of the frame-shaped connecting member 105.
  • a plurality of grooves 105 d arranged at intervals and staggeredly distributed are arranged symmetrically with respect to the bending central axis B-B of the foldable display device 100.
  • the plurality of grooves 105d arranged at intervals and staggeredly distributed includes a plurality of repeating units 1052, and the plurality of repeating units 1052 are repeatedly arranged at equal intervals along the length direction of the frame-shaped connecting member 105. The spacing between two adjacent repeating units 1052 is equal.
  • Each repeating unit 1052 includes a first row of first grooves 105d1 and a second row of first grooves 105d1 arranged along the length direction of the frame-shaped connecting member 105.
  • the number of the first row of first grooves 105d1 is less than that of the second row.
  • the number of the first groove 105d1 in the row, the first groove 105d1 in the second row is arranged close to the bending center axis BB, the first groove 105d1 in the first groove 105d1 in the first row and the first groove 105d1 in the second row
  • the first grooves 105d1 are staggered.
  • the distance between two adjacent first grooves 105d1 in the same row is 0.1 mm-0.3 mm, for example, 0.15 mm or 0.2 mm; one of the two adjacent first grooves 105d1 along the length of the frame-shaped connector 105 The distance between them is 0.05 mm-0.15 mm, for example, 0.08 mm, 0.1 mm, or 0.12 mm.
  • Each repeating unit 1052 also includes two second grooves 105d2 arranged in the same row as the second row of first grooves 105d1 and located on two opposite edges of the frame-shaped connecting member 105.
  • the second groove 105d2 is U-shaped, and the U-shaped opening faces away from the first groove 105d1.
  • FIG. 6B it is a schematic diagram of the first groove shown in FIG. 6A.
  • the size of the first groove 105d1 in the width direction of the frame-shaped portion 1051 of the frame-shaped connector 105 is larger than the size of the first groove 105d1 in the length direction of the frame-shaped connector 105.
  • the shape of the first groove 105d1 is a rod shape.
  • the cross section of the first groove 105d1 includes two opposite and parallel straight sections and two opposite arc sections connecting the two straight sections.
  • the length b of the two straight line segments is 1 mm-10 mm, for example, 2 mm, 4 mm, 5 mm or 8 mm; the distance a between the two straight line segments is 0.1 mm-0.5 mm, for example 0.2 mm, 0.4 mm or 0.6 mm.
  • the first groove 105d1 will be stretched and deformed.
  • FIG. 6C it is another schematic plan view of the first groove in the embodiment of the application.
  • the shape of the first groove 105d1 shown in FIG. 6C is a diamond shape.
  • the cross section of the first groove 1051 includes a first inclined straight line section, a second inclined straight line section, a third inclined straight line section, a fourth inclined straight line section, a first circular arc section, and a second circular arc section.
  • the first inclined straight line section is connected with the second inclined straight line section
  • the third inclined straight line section is connected with the fourth inclined straight line section
  • the first inclined straight line section is opposite to the third inclined straight line section and is connected by the first circular arc section
  • the second inclined straight line section is connected by the first circular arc section.
  • the straight line segment is opposite to the fourth inclined straight line segment and is connected by the second arc segment.
  • the first inclined straight line segment and the second inclined straight line segment may also be connected by a circular arc segment, and the connection between the third oblique straight line segment and the fourth inclined straight line segment may also be connected by a circular arc segment.
  • the depth of the groove is less than the thickness of the frame-shaped connector.
  • the first groove 105d1 is filled with elastic rubber, for example, the elastic rubber is silicone rubber, so as to increase the ductility of the frame-shaped connecting member 105 in the first region 105b .
  • the depth of the first groove 105d1 may also decrease in the direction in which the first area 105b points to the second area 105c.
  • the elastic rubber is silicone rubber, the elongation rate of the silicone rubber is at least 50%.
  • the silicone rubber is liquid before curing and has good fluidity.
  • the frame-shaped connector 105 It is easy to completely fill the first groove 105d1 during the silk-screen printing process, and in the frame-shaped connector A thin layer of silicone rubber is formed on the surface of 105. Due to the high elasticity and elongation of the silicone rubber, the frame-shaped connector 105 can be moved synchronously with other film layers during the bending process, and the relative dislocation amount is greatly reduced, so that the problem of peeling will not occur.
  • the filling design of highly elastic silicone rubber makes the first area 105b of the frame-shaped connector 105 have better recovery performance after bending. The marks generated by the folding and the ripples in the middle position are also difficult to be observed due to the rapid recovery and will not appear. Obvious creases and ripples caused by folding are not good in appearance.
  • FIG. 6D it is a second partial enlarged schematic view of the frame-shaped connector in FIG. 5.
  • the frame-shaped connector shown in FIG. 6D is basically similar to the frame-shaped connector shown in FIG. 6A, except that, in the direction in which the first area 105b points to the second area 105c, the distance between two adjacent repeating units 1052 It is increased to increase the elastic modulus of the frame-shaped connector 105 of the first area 105b in the direction in which the first area 105b points to the second area 105c.
  • the groove 105d provided by the frame-shaped connecting member 105 can be arranged in multiple sections along the length direction of the frame-shaped connecting member 105.
  • the distance between adjacent grooves 105d in different sections, the size of the groove 105d, and the The depth and density of the grooves 105d are different, and finally selected according to the folding state of the flexible display module, where the folding state of the flexible display module includes U-shaped bending, wedge-shaped bending, or drop-shaped bending.
  • the grooves 105d are densely distributed, which is beneficial to increase the elongation and make the elastic performance better.

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Abstract

一种可折叠显示装置（100），可折叠显示装置（100）包括第一壳体（1011）、与第一壳体（1011）可转动连接的第二壳体（1012）、柔性显示模组以及硬质可折叠功能层（103），柔性显示模组一侧设置在第一壳体（1011）和第二壳体（1012）上，柔性显示模组的另一侧设置硬质可折叠功能层（103），且硬质可折叠功能层（103）位于柔性显示模组的出光侧。

Description

可折叠显示装置 技术领域
本申请涉及显示技术领域，尤其涉及一种可折叠显示装置。
 背景技术
柔性显示装置应用市场越来越受市场青睐。柔性屏手机是指采用可弯曲、柔韧性佳屏幕的手机，相较于传统屏幕，柔性屏幕优势明显，不仅在体积上更加轻薄，功耗上也低于原有器件，有助于提升设备的续航能力，同时基于其可弯曲以及柔韧性佳的特性，其耐用程度也大大高于传统屏幕，降低设备意外损伤的概率。
如图1所示，其为传统柔性显示装置的分解示意图。柔性显示装置包括前框200、柔性显示面板201、金属片（Metal sheet）202、支撑板（support plate）203以及中框组件204等。金属片整面设置在柔性显示面板的下表面以起到减缓波纹（waviness）以及折痕的作用。支撑板仅分布在非弯折区，支撑板强度高起到支撑柔性显示面板和提高柔性显示面板与整机组装的便利性，因其在弯折区中隔开的，支撑板相对较厚（大约0.3毫米），导致中间弯折区存在段差，整机的平整性能很难确保。另外，前框或装饰条来压住柔性显示面板的边缘，造成前框的上表面和柔性显示面板的上表面不在同一个平面，存在的段差导致柔性显示装置的使用触感不好，且外观也不美观。
因此，有必要提出一种技术方案以解决支撑板设置在非弯折区以及前框设置在柔性显示面板的边缘导致柔性显示装置存在不平整的问题。
 技术问题
本申请的目的在于提供一种可折叠显示装置，可折叠显示装置具有良好的平整性，且具有良好的外观。
 技术解决方案
为实现上述目的，本申请提供一种可折叠显示装置，包括：
第一壳体、与第一壳体可转动连接的第二壳体、柔性显示模组、以及硬质
可折叠功能层，
所述柔性显示模组一侧设置在所述第一壳体和所述第二壳体上，所述柔性
显示模组的另一侧设置所述硬质可折叠功能层，且所述硬质可折叠功能层位于所述柔性显示模组的出光侧。
在上述可折叠显示装置中，所述硬质可折叠功能层为超薄玻璃，所述超薄玻璃的厚度为10微米-300微米。
在上述可折叠显示装置中，所述可折叠显示装置包括第一非弯折区、第二非弯折区以及连接于所述第一非弯折区和所述第二非弯折区之间的弯折区，所述第一壳体和所述第二壳体均具有容纳空腔，所述柔性显示模组对应所述第一非弯折区的部分设置于所述第一壳体的容纳空腔中，所述柔性显示模组对应所述第二非弯折区的部分设置于所述第二壳体的容纳空腔中，所述柔性显示模组对应所述弯折区的部分连接于所述柔性显示模组对应所述第一非弯折区的部分和所述柔性显示模组对应所述第二非弯折区的部分之间。
在上述可折叠显示装置中，所述可折叠显示装置还包括框形连接件，所述框形连接件包括框形部以及位于所述框形部内的所述开口，所述框形部的一表面与所述第一壳体和所述第二壳体连接，所述框形部的另一表面与所述硬质可折叠功能层连接，所述框形连接件的开口对应所述柔性显示模组设置，所述框形部的一表面与所述框形部的另一表面相对。
在上述可折叠显示装置中，所述可折叠显示装置包括第一非弯折区、第二非弯折区以及连接于所述第一非弯折区和所述第二非弯折区之间的弯折区，所述框形连接件具有第一区域以及第二区域，所述框形连接件的第一区域对应所述弯折区，所述框形连接件的所述第二区域对应所述第一非弯折区和所述第二非弯折区，所述框形连接件对应所述第二区域的的部分固定于所述第一壳体上和所述第二壳体上，所述第一区域的所述框形连接件的弹性模量小于所述第二区域的所述框形连接件的弹性模量。
在上述可折叠显示装置中，所述第一区域的所述框形连接件的弹性模量为1MPa-100MPa，所述第二区域的所述框形连接件的弹性模量大于150GPa。
在上述可折叠显示装置中，所述第一区域的所述框形连接件设置有多个间隔且交错设置的凹槽。
在上述可折叠显示装置中，多个间隔且交错设置的所述凹槽关于所述可折叠显示装置的弯折中心轴对称设置，每个所述凹槽沿所述框形连接件的所述框形部的宽度方向的尺寸大于所述同一所述凹槽沿所述框形连接件的长度方向的尺寸。
在上述可折叠显示装置中，所述凹槽的深度小于或等于所述框形连接件的厚度。
在上述可折叠显示装置中，所述凹槽的深度小于所述框形连接件的厚度，所述凹槽中填充有弹性橡胶。
在上述可折叠显示装置中，所述框形连接件的框形部的宽度等于所述硬质可折叠功能层的宽度与所述柔性显示模组的宽度的差值的1/2，所述硬质可折叠功能层的宽度大于所述柔性显示模组的宽度。
在上述可折叠显示装置中，所述框形连接件的外围边缘与所述硬质可折叠功能层的外围边缘平齐，所述框形连接件的外围边缘与所述第一壳体以及所述第二壳体的外围边缘平齐。
在上述可折叠显示装置中，所述框形连接件的制备材料选自不锈钢、非晶材料、镍铜合金以及铝合金中的至少一种。
在上述可折叠显示装置中，所述开口的尺寸大于或等于柔性显示模组的尺寸。
在上述可折叠显示装置中，所述框形连接件的框形部的宽度大于或等于所述第一壳体的所述第二壳体的侧板的宽度。
在上述可折叠显示装置中，所述可折叠显示装置还包括设置于所述硬质可折叠功能层远离所述柔性显示模组的一侧的保护膜，所述保护膜的厚度为5微米-30微米。
在上述可折叠显示装置中，所述保护膜的制备材料选自聚酰亚胺或聚对苯二甲酸乙二醇酯中的至少一种。
在上述可折叠显示装置中，所述保护膜的厚度为10微米-25微米。
在上述可折叠显示装置中，所述硬质可折叠功能层对应所述柔性显示模组的部分与所述柔性显示模组通过光学胶层连接，所述硬质可折叠功能层的宽度大于所述柔性显示模组的宽度，所述硬质可折叠功能层的长度大于所述柔性显示模组的长度。
在上述可折叠显示装置中，所述硬质可折叠功能层的杨氏模量为50GPa-100GPa，所述硬质可折叠功能层的硬度为5GPa-15GPa。
 有益效果
相对于传统技术，本申请可折叠显示装置去除前框以及支撑板，将硬质可折叠功能层设置在可折叠显示模组的出光侧且固定在壳体上，以对可折叠显示装置起到刚性支撑作用的同时，作为可折叠显示装置出光侧的外观件，由于硬质可折叠功能层经弯折后不会出现折叠的折痕，可以避免可折叠显示装置出现不平整或者折痕，且硬质可折叠功能层的表面硬度与强度高、耐摩擦性能佳，避免了传统无色聚酰亚胺（CPI，Colorless Polyimide）材质的盖板（Cover Window，CW）表面硬度低、不耐刮的问题。此可折叠显示装置基本可以接近目前硬屏显示装置的规格要求，更符合终端使用者的应用需求。
进一步地，采用框形连接件将硬质可折叠功能层连接在壳体上，利用框形连接件的刚性与壳体的刚性以及硬质可折叠功能层的刚性均具有匹配性，以避免硬质可折叠功能层直接固定于壳体上出现破裂的问题，且硬质可折叠功能层固定在框形连接件上，方便柔性显示屏模组的组装更换维修。
进一步地，在硬质可折叠功能层远离柔性显示模组的表面设置保护膜，保护膜对硬质可折叠功能层起到防爆破的作用的同时，保护膜可以为预备屏以便于更换，且保护膜相对于传统无色聚酰亚胺的厚度更小，避免出现明显的折痕。
 附图说明
图1为传统柔性显示装置的分解示意图；
图2为本申请可折叠显示装置处于展平状态时的立体示意图；
图3为图2所示可折叠显示装置处于折叠状态时的立体示意图；
图4为沿图2所示可折叠显示装置A-A切线的截面示意图；
图5为图2所示可折叠显示装置的分解示意图，其中，图5省略了图4中的偏光片以及后盖板；
图6A为图5中框形连接件的第一种局部放大示意图；
图6B为图6A所示第一凹槽的示意图；
图6C为本申请实施例第一凹槽的另一种平面示意图；
图6D为图5中框形连接件的第二种局部放大示意图；
图7为图3所示处于折叠状态时的可折叠显示装置的截面示意图，其中，柔性显示模组呈水滴型弯折；
图8为图7所示处于折叠状态时的可折叠显示装置的局部放大示意图。
附图标示如下：
100 可折叠显示装置；100a 第一非弯折区；100b 第二非弯折区；100c弯折区；1011 第一壳体；1012 第二壳体；103 硬质可折叠功能层；104 保护膜；105 框形连接件；1051 框形部；105a 开口；105b 第一区域；105c 第二区域；105d 凹槽；105d1第一凹槽；105d2第二凹槽；1011a容纳空腔；1021，201柔性显示面板；1022 偏光片；1023 后盖板； 1024 缓冲层；200前框；202 金属片；203 支撑板；204中框组件；1061 第一支撑板；1062第二支撑板。
 本发明的实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
请参阅图2-5，图2为本申请可折叠显示装置处于展平状态时的立体示意图，图3为图2所示可折叠显示装置处于折叠状态时的立体示意图，图4为沿图2所示可折叠显示装置A-A切线的截面示意图，图5为图2所示可折叠显示装置的分解示意图。
可折叠显示装置100包括第一壳体1011、第二壳体1012、柔性显示模组、硬质可折叠功能层103、保护膜104以及框形连接件105。可折叠显示装置100具有第一非弯折曲100a、第二非弯折曲100b以及连接于第一非弯折区100a以及第二非弯折区100b之间的弯折区100c。
第一壳体1011与第二壳体1012相对设置，且第一壳体1011和第二壳体1012通过铰链组件可转动连接。第一壳体1011和第二壳体1012通过铰链组件相对转动，以实现可折叠显示装置的折叠。第一壳体1011和第二壳体1012均为中框。
第一壳体1011用于支撑柔性显示模组对应第一非弯折区100a的部分，第二壳体1012用于支撑柔性显示模组对应第二非弯折区100b的部分。第一壳体包括底板以及三个依次连接的侧板，底板和三个依次连接的侧板围合成容纳空腔1011a，柔性显示模组对应第一非弯折区100a的部分设置于第一壳体1011的容纳空腔1011a中。第二壳体1012包括底板以及三个依次连接的侧板，底板和三个依次连接的侧板围合成容纳空腔，柔性显示模组对应第二非弯折区100b的部分设置于第二壳体1012的容纳空腔中，柔性显示模组对应弯折区100c的部分连接于柔性显示模组对应第一非弯折区100a的部分和柔性显示模组对应第二非弯折区100b的部分之间。相对于传统技术，通过将柔性显示模组容置于第一壳体1011和第二壳体1012的容纳空腔中，使得柔性显示模组更好地被保护。
柔性显示模组一侧设置在第一壳体1011和第二壳体1012上。柔性显示模组包括柔性显示面板1021、偏光片1022、后盖板1023、缓冲层1024。缓冲层1024、后盖板1023、柔性显示面板1021以及偏光片1022依次叠置。
柔性显示面板1021用于显示图像。柔性显示面板1021为柔性有机发光二极管显示面板。缓冲层1024起到缓冲作用。缓冲层1024对应第一非弯折区100a以及第二非弯折区100b的部分分别设置于第一壳体1011和第二壳体1012的底板上。缓冲层1024为泡沫层。后盖板1023用于保护柔性显示面板1021的出光面的背面。后盖板1023与缓冲层1024通过胶粘层连接。柔性显示面板1021与后盖板1023之间通过胶粘层连接。偏光片1022用于提高环境光的透过率，以提高柔性显示面板1021显示时的对比度。偏光片1022与柔性显示面板1021之间通过胶粘层连接。
柔性显示模组的另一侧设置硬质可折叠功能层103。硬质可折叠功能层103用于为柔性显示模组提供刚性支撑，且作为可折叠显示装置100的外观件。硬质可折叠功能层103是透明的。硬质可折叠功能层103对应第一非弯折区100a的部分连接在第一壳体1011上，硬质可折叠功能层103对应第二非弯折区100b的部分连接在第二壳体1012上，且硬质可折叠功能层103位于柔性显示模组的出光侧。
硬质可折叠功能层103的宽度大于柔性显示模组的宽度，硬质可折叠功能层103的长度大于柔性显示模组的长度，以使得硬质可折叠功能层103能对整个柔性显示模组起到刚性支撑的作用的同时，硬质可折叠功能层103超出柔性显示模组的部分可以固定于第一壳体1011和第二壳体1012上。
硬质可折叠功能层103不仅具有良好的刚性且可弯折。硬质可折叠功能层103为超薄玻璃。超薄玻璃的材质为无机透明玻璃。超薄玻璃的厚度为10微米-300微米。超薄玻璃的厚度也可以为20微米-300微米，例如超薄玻璃的厚度为30微米、40微米、50微米、60微米、70微米以及100微米等。硬质可折叠功能层103的杨氏模量为50GPa-100GPa，例如为60GPa、70GPa、80GPa等，以使得硬质可折叠功能层103具有高强度，具有更好的机械性能。硬质可折叠功能层103的硬度为5GPa-15GPa，例如硬度为6GPa、8GPa、10GPa，以使得硬质可折叠功能层103具有高的表面硬度，具有良好的耐摩擦性能，提高可折叠显示装置的耐刮性能，其中，硬度为采用压痕法测得的硬度。
此外，本申请超薄玻璃在温度为20℃-300℃时的线性热膨胀系数为（7.0-10.0）ppm/℃，例如为8ppm/℃。超薄玻璃的玻璃化转变温度为550℃-650℃，例如为600℃。超薄玻璃的粗糙度小于0.5纳米，例如为0.001纳米。超薄玻璃的光学弹性系数为(15-40)nm/cm/MPa，例如为25nm/cm/MPa。
相对于传统技术在第一壳体以及第二壳体上设置支撑板以为非弯折区的柔性显示模组提供刚性支撑会导致出现段差，本申请去除了支撑板，将柔性显示模组整体的尺寸收窄，以容置于第一壳体1011和第二壳体1012中的容置空腔中，以整面的硬质可折叠功能层103为柔性显示模组提供刚性支撑，避免出现段差，且去除前框，以硬质可折叠功能层103作为外观件，进一步避免出现段差，保证可折叠显示装置在弯折过程中具有良好的平整性。
硬质可折叠功能层103为超薄玻璃时，框形连接件105用于将硬质可折叠功能层103连接在第一壳体1011和第二壳体1012上，避免硬质可折叠功能层103厚度较薄及强度不足而不能很好直接粘贴固定在第一壳体1011和第二壳体1012上，从而避免硬质可折叠功能层103出现破裂问题。框形连接件105将硬质可折叠功能层103框贴于第一壳体1011和第二壳体1012上，更有利于柔性显示模组的更换以及维修等。且框形连接件105的刚性较大可以防止与边框连接件连接的硬质可折叠功能层103的边框部分受力而破裂。
框形部1051的一表面与第一壳体1011和第二壳体1012连接，框形部1051的另一表面与硬质可折叠功能层103连接。框形连接件105靠近硬质可折叠功能层103的表面全部涂覆有胶粘剂，框形连接件105与第一壳体1011通过胶粘层连接，框形连接件105与第二壳体1012通过胶粘层连接。
硬质可折叠功能层103对应柔性显示模组的部分与柔性显示模组通过光学胶层连接，以使得硬质可折叠功能层103与柔性显示模组在弯折过程中具有同步性，且避免两者之间出现缝隙而出现段差导致不平整性。具体地，硬质可折叠功能层103对应柔性显示模组的部分与偏光片1022通过光学胶层连接。
可折叠显示装置100处于展平状态时，连接柔性显示模组以及硬质可折叠功能层103的光学胶层靠近硬质可折叠功能层103的表面与框形连接件105靠近硬质可折叠功能层103的表面位于同一平面，以保证硬质可折叠功能层103连接于框形连接件105的部分与连接于柔性显示模组的部分位于同一平面，提高硬质可折叠功能层103的平整性，从而提高可折叠显示装置的平整性。
框形连接件105包括框形部1051以及位于框形部1051内的开口105a，框形连接件105为矩形。开口105a也为矩形。框形连接件105的开口105a对应柔性显示模组设置，且开口105a的尺寸大于或等于柔性显示模组的尺寸，以避免框形连接件105对柔性显示模组中的柔性显示面板1021发出的光造成遮挡，且使框形连接件105作为柔性显示模组的边框。
框形连接件105的框形部1051的宽度等于硬质可折叠功能层103的宽度与柔性显示模组的宽度的差值的1/2，以便于柔性显示模组组装于第一壳体1011以及第二壳体1012上。
框形连接件105的框形部1051的宽度大于或等于第一壳体1011和第二壳体1012的侧板的宽度，以使得框形连接件105与第一壳体1011和第二壳体1012之间连接的面积最大化，使得框形连接件105与第一壳体1011和第二壳体1012之间能更好地连接，降低框形连接件105与第一壳体1011和第二壳体1012分离的风险。具体地，如图4所示，框形连接件105的框形部1051的宽度大于第一壳体1011和第二壳体1012的侧板的宽度。
框形连接件105的外围边缘与硬质可折叠功能层103的外围边缘平齐，框形连接件105的外围边缘与第一壳体1011以及第二壳体1012的外围边缘平齐，以使可折叠显示装置100的边缘更加美观，终端用户具有更好的使用体验。
硬质可折叠功能层103为超薄玻璃时，保护膜104用于对硬质可折叠功能层103起到防爆破作用的同时，作为预备屏以便于更换。保护膜104设置于硬质可折叠功能层103远离柔性显示模组的一侧，保护膜104的厚度为5微米-30微米。相对于传统透明聚酰亚胺盖板，本申请将保护膜104的厚度薄化，避免保护膜104在折叠过程中出现明显的折痕。保护膜104的厚度也可以为10微米-25微米，例如为15微米、18微米以及20微米。保护膜的制备材料选自聚酰亚胺或聚对苯二甲酸乙二醇酯中的至少一种。
框形连接件105包括第一区域105b以及第二区域105c，框形连接件105的第一区域105b对应弯折区100c，框形连接件105的第二区域105c对应第一非弯折区100a和第二非弯折区100b。第一区域105b位于两个第二区域105c之间。框形连接件105对应第二区域105c的的部分固定于第一壳体1011上和第二壳体1012上。第一区域105b的框形连接件105的弹性模量小于第二区域105c的框形连接件105的弹性模量，以使得框形连接件105对应的第一非弯折区100a以及第二非弯折区100b的部分的刚性与第一壳体1011、第二壳体1012以及硬质可折叠功能层103的刚性均能匹配，且保证框形连接件105对应弯折区100c的部分易弯折且具有较高的延展性，在可折叠显示装置弯折过程中容易延伸恢复。
第一区域105b的框形连接件105设置有多个间隔且交错设置的凹槽105d，以使得第一区域105b的框形连接件105的弹性模量小于第二区域105c的框形连接件105的弹性模量。第一区域105b的框形连接件105的弹性模量为1MPa-100MPa，例如为5MPa、10MPa、30MPa、50MPa以及85MPa；第二区域105c的框形连接件105的弹性模量为大于150GPa，例如为190GPa、200GPa等。
框形连接件105的制备材料选自不锈钢、非晶材料、镍铜合金以及铝合金中的至少一种。具体地，框形连接件105的制备材料为不锈钢，以使得框形连接件105具有良好的刚性以及可折叠性。
如图5所示，可折叠显示装置100处于展平状态时，框形连接件105处于展平状态，第一区域105b的框形连接件105的长度为W，柔性显示模组对应弯折区100c的部分长度为L1，第一区域105b的框形连接件105的长度W大于柔性显示模组对应弯折区100c的部分的长度L1。可折叠显示装置处于完全弯折状态时，柔性显示模组对应弯折区100c的部分的长度为L2，例如柔性显示模组呈如图7和图8所示的水滴型弯折时，柔性显示模组对应弯折区100c的部分的长度L2大于第一区域105b的框形连接件105的长度W。其中，图7为图3所示处于折叠状态时的可折叠显示装置的截面示意图，图8为图7所示处于折叠状态时的可折叠显示装置的局部放大示意图。图7所示可折叠显示装置包括第一支撑板1061以及第二支撑板1062，第一支撑板1061和第二支撑板1062均设置于第一壳体1011的容纳空腔中，且第一支撑板1061和第二支撑板1062均设置于第二壳体1012的容纳空腔中，可折叠显示装置完全弯折时，第一壳体1011中的第一支撑板1061支撑柔性显示模组对应第一非弯折区的部分，第二壳体1012中的第一支撑板1061支撑柔性显示模组对应第二非弯折区的部分，第一壳体1011中的第二支撑板1062和第二壳体1012中的第二支撑板1062与柔性显示模组对应弯折区的部分局部贴附，以使柔性显示模组对应弯折区的部分平滑地过渡为水滴型。
如图6A所示，其为图5中框形连接件的第一种局部放大示意图。第一区域105b的框形连接件105设置多个间隔设置的凹槽105d，多个间隔设置的凹槽105d交错式分布。凹槽105d包括第一凹槽105d1以及第二凹槽105d2。第二凹槽105d2设置在第一区域105b的框形连接件105的两个相对边缘上，第一凹槽105d1设置在第一区域105b的框形连接件105的两个相对边缘之间，两个相对的边缘为框形连接件105的宽度方向上相对的边缘。凹槽的深度等于框形连接件的厚度。第一凹槽105d1的深度以及第二凹槽105d2的深度均等于框形连接件105的厚度。
多个间隔设置且交错分布的凹槽105d关于可折叠显示装置100的弯折中心轴B-B对称设置。多个间隔设置且交错分布的凹槽105d包括多个重复单元1052，多个重复单元1052沿着框形连接件105的长度方向等间距且重复地排布。相邻两个重复单元1052之间的间距相等。
每个重复单元1052包括沿框形连接件105的长度方向排布的第一列第一凹槽105d1以及第二列第一凹槽105d1，第一列第一凹槽105d1的数目少于第二列第一凹槽105d1的数目，第二列第一凹槽105d1靠近弯折中心轴B-B设置，第一列第一凹槽105d1中的第一凹槽105d1与第二列第一凹槽105d1中的第一凹槽105d1交错设置。同一列的相邻两个第一凹槽105d1之间的间距为0.1毫米-0.3毫米，例如为0.15毫米或0.2毫米；沿框形连接件105的长度方向相邻两个第一凹槽105d1之间的间距为0.05毫米-0.15毫米，例如为0.08毫米、0.1毫米或0.12毫米。
每个重复单元1052还包括与第二列第一凹槽105d1同列设置且位于框形连接件105的两个相对边缘上的两个第二凹槽105d2。第二凹槽105d2为U型，U型的开口背离第一凹槽105d1。
如图6B所示，其为图6A所示第一凹槽的示意图。第一凹槽105d1沿框形连接件105的框形部1051的宽度方向的尺寸大于第一凹槽105d1沿框形连接件105的长度方向的尺寸。第一凹槽105d1的形状为棒状。第一凹槽105d1的横截面包括两个相对且平行的直线段以及两个连接两个直线段且相对的弧形段。两个直线段的长度b均为1毫米-10毫米，例如为2毫米、4毫米、5毫米或8毫米；两个直线段之间的间距a为0.1毫米-0.5毫米，例如为0.2毫米、0.4毫米或0.6毫米。可折叠显示装置100弯折过程中，第一凹槽105d1会被拉伸而发生变形。
如图6C所示，其为本申请实施例第一凹槽的另一种平面示意图。图6C所示第一凹槽105d1的形状为钻石型。第一凹槽1051的横截面包括第一倾斜直线段、第二倾斜直线段、第三倾斜直线段、第四倾斜直线段、第一圆弧段以及第二圆弧段。第一倾斜直线段与第二倾斜直线段连接，第三倾斜直线段与第四倾斜直线段连接，第一倾斜直线段与第三倾斜直线段相对且通过第一圆弧段连接，第二倾斜直线段与第四倾斜直线段相对且通过第二圆弧段连接。第一倾斜直线段与第二倾斜直线段之间也可以通过圆弧段连接，第三倾斜直线段与第四倾斜直线段连接之间也可以通过圆弧段连接。
在其他实施例中，凹槽的深度小于框形连接件的厚度。第一凹槽105d1的深度小于框形连接件105的厚度时，于第一凹槽105d1中填充弹性橡胶，例如弹性橡胶为硅橡胶，以增加第一区域105b的框形连接件105的延展性。第一凹槽105d1的深度也可以在第一区域105b指向第二区域105c的方向上递减。弹性橡胶为硅橡胶时，硅橡胶的延伸率至少达50%，此硅橡胶固化前为液态，流动性较好，在丝印制程极易完全填充第一凹槽105d1中，并在框形连接件105表面形成薄层硅橡胶层。由于硅橡胶的高弹性与延伸率，框形连接件105在弯折过程中可跟随其他膜层同步进行错动，相对位错量大大减小，如此就不会出现剥离的问题。高弹性的硅橡胶的填充设计，使得框形连接件105的第一区域105b弯折后恢复性能更佳，折叠产生的痕迹与中间位置的波纹也因迅速恢复而不易被观察到，不会出现折叠造成的明显折痕与波纹等外观不良。
如图6D所示，其为图5中框形连接件的第二种局部放大示意图。图6D所示框形连接件与图6A所示框形连接件基本相似，不同之处在于，在第一区域105b指向第二区域105c的方向上，相邻两个重复单元1052之间的间距递增，以使得在第一区域105b指向第二区域105c的方向上第一区域105b的框形连接件105的弹性模量递增。
可以理解的是，框形连接件105设置的凹槽105d沿着框形连接件105的长度方向可以分多段设置，不同段的相邻凹槽105d之间的间距、凹槽105d的大小、凹槽105d的深度以及密集程度不同，最终根据柔性显示模组的折叠状态选择，其中，柔性显示模组的折叠状态包括U型弯折、楔形弯折或者水滴型弯折等。例如对应柔性显示模组弯折变形大的区域，凹槽105d分布较密集，有利于提升延伸率以使弹性性能佳。
以上实施例的说明只是用于帮助理解本申请的技术方案及其核心思想；本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例的技术方案的范围。

Claims (20)

  1. 一种可折叠显示装置，其中，包括：
    第一壳体、与第一壳体可转动连接的第二壳体、柔性显示模组、以及硬质可折叠功能层，
    所述柔性显示模组一侧设置在所述第一壳体和所述第二壳体上，所述柔性显示模组的另一侧设置所述硬质可折叠功能层，且所述硬质可折叠功能层位于所述柔性显示模组的出光侧。
  2. 根据权利要求1所述的可折叠显示装置，其中，所述硬质可折叠功能层为超薄玻璃，所述超薄玻璃的厚度为10微米-300微米。
  3. 根据权利要求1所述的可折叠显示装置，其中，所述可折叠显示装置包括第一非弯折区、第二非弯折区以及连接于所述第一非弯折区和所述第二非弯折区之间的弯折区，所述第一壳体和所述第二壳体均具有容纳空腔，所述柔性显示模组对应所述第一非弯折区的部分设置于所述第一壳体的容纳空腔中，所述柔性显示模组对应所述第二非弯折区的部分设置于所述第二壳体的容纳空腔中，所述柔性显示模组对应所述弯折区的部分连接于所述柔性显示模组对应所述第一非弯折区的部分和所述柔性显示模组对应所述第二非弯折区的部分之间。
  4. 根据权利要求1所述的可折叠显示装置，其中，所述可折叠显示装置还包括框形连接件，所述框形连接件包括框形部以及位于所述框形部内的所述开口，所述框形部的一表面与所述第一壳体和所述第二壳体连接，所述框形部的另一表面与所述硬质可折叠功能层连接，所述框形连接件的所述开口对应所述柔性显示模组设置，所述框形部的一表面与所述框形部的另一表面相对。
  5. 根据权利要求4所述的可折叠显示装置，其中，所述可折叠显示装置具有第一非弯折区、第二非弯折区以及连接于所述第一非弯折区和所述第二非弯折区之间的弯折区，所述框形连接件包括第一区域以及第二区域，所述框形连接件的第一区域对应所述弯折区，所述框形连接件的所述第二区域对应所述第一非弯折区和所述第二非弯折区，所述框形连接件对应所述第二区域的的部分固定于所述第一壳体上和所述第二壳体上，所述第一区域的所述框形连接件的弹性模量小于所述第二区域的所述框形连接件的弹性模量。
  6. 根据权利要求5所述的可折叠显示装置，其中，所述第一区域的所述框形连接件的弹性模量为1MPa-100MPa，所述第二区域的所述框形连接件的弹性模量大于150GPa。
  7. 根据权利要求5所述的可折叠显示装置，其中，所述第一区域的所述框形连接件设置有多个间隔且交错设置的凹槽。
  8. 根据权利要求7所述的可折叠显示装置，其中，多个间隔且交错设置的所述凹槽关于所述可折叠显示装置的弯折中心轴对称设置，每个所述凹槽沿所述框形连接件的所述框形部的宽度方向的尺寸大于所述同一所述凹槽沿所述框形连接件的长度方向的尺寸。
  9. 根据权利要求7所述的可折叠显示装置，其中，所述凹槽的深度小于或等于所述框形连接件的厚度。
  10. 根据权利要求7所述的可折叠显示装置，其中，所述凹槽的深度小于所述框形连接件的厚度，所述凹槽中填充有弹性橡胶。
  11. 根据权利要求4所述的可折叠显示装置，其中，所述框形连接件的框形部的宽度等于所述硬质可折叠功能层的宽度与所述柔性显示模组的宽度的差值的1/2，所述硬质可折叠功能层的宽度大于所述柔性显示模组的宽度。
  12. 根据权利要求4所述的可折叠显示装置，其中，所述框形连接件的外围边缘与所述硬质可折叠功能层的外围边缘平齐，所述框形连接件的外围边缘与所述第一壳体以及所述第二壳体的外围边缘平齐。
  13. 根据权利要求4所述的可折叠显示装置，其中，所述框形连接件的制备材料选自不锈钢、非晶材料、镍铜合金以及铝合金中的至少一种。
  14. 根据权利要求4所述的可折叠显示装置，其中，所述开口的尺寸大于或等于柔性显示模组的尺寸。
  15. 根据权利要求4所述的可折叠显示装置，其中，所述框形连接件的框形部的宽度大于或等于所述第一壳体的所述第二壳体的侧板的宽度。
  16. 根据权利要求1所述的可折叠显示装置，其中，所述可折叠显示装置还包括设置于所述硬质可折叠功能层远离所述柔性显示模组的一侧的保护膜，所述保护膜的厚度为5微米-30微米。
  17. 根据权利要求16所述的可折叠显示装置，其中，所述保护膜的制备材料选自聚酰亚胺或聚对苯二甲酸乙二醇酯中的至少一种。
  18. 根据权利要求16所述的可折叠显示装置，其中，所述保护膜的厚度为10微米-25微米。
  19. 根据权利要求1所述的可折叠显示装置，其中，所述硬质可折叠功能层对应所述柔性显示模组的部分与所述柔性显示模组通过光学胶层连接，所述硬质可折叠功能层的宽度大于所述柔性显示模组的宽度，所述硬质可折叠功能层的长度大于所述柔性显示模组的长度。
  20. 根据权利要求1所述的可折叠显示装置，其中，所述硬质可折叠功能层的杨氏模量为50GPa-100GPa，所述硬质可折叠功能层的硬度为5GPa-15GPa。
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